Fig. 4

Gain and phase on upper extremity channels (A1A2 and A1A3) with various elbow joint angles. The solid curves with symbols refer to the y-axis on the left, depict the gain (a for A1A2, b for A1A3) and phase (c for A1A2, d for A1A3). The dotted curves with symbols refer to the y-axis on the right, represent the average of standard deviation from the measurements over 3 days